X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 5.0.3) with ESMTP id 870220 for flyrotary@lancaironline.net; Fri, 09 Dec 2005 19:04:11 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=13brv3@bellsouth.net Received: from ibm67aec.bellsouth.net ([65.6.194.9]) by imf22aec.mail.bellsouth.net with ESMTP id <20051210000326.MEUM7752.imf22aec.mail.bellsouth.net@ibm67aec.bellsouth.net> for ; Fri, 9 Dec 2005 19:03:26 -0500 Received: from rd ([65.6.194.9]) by ibm67aec.bellsouth.net with ESMTP id <20051210000325.LSUL7041.ibm67aec.bellsouth.net@rd> for ; Fri, 9 Dec 2005 19:03:25 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Radiator Expansion Tank Date: Fri, 9 Dec 2005 18:03:26 -0600 Message-ID: <000001c5fd1d$24f8c810$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C5FCEA.DA5E5810" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C5FCEA.DA5E5810 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Al, Rusty and others. =20 I've been a little confused with the set- up recommended. Do you have a pressure cap on the Radiator as well as the Expansion tank and do you = have an overflow bottle attached to the expansion tank. I've also seen where the rad pressure cap is not on the rad but on the return to the pump.=20 =20 =20 I'm not sure how I got dragged into this :-) =20 =20 Take a look at the system that Mazda used on the FD. It's a pretty good system, give or take the plastic parts. Hmmm, I wonder if the RX-8 uses = the same system. Anyone know? =20 As I understand it, the point is to get all the air out of the coolant = loop. The FD actually has two pressure caps, though only one has a pressure = relief valve in it. The one without the valve is simply a filler cap, and is located at the high point of the system (WP housing outlet on the FD). = =20 The one with the pressure relief valve (normal radiator cap) is located = on top of a small tank that is appropriately named the "Air Separator Tank" (AST). This tank has two small hoses, which flow coolant through the = tank all the time. One hose comes from the output of the water pump, as high = as possible in the engine. It runs into the AST, about half way between = top and bottom of the tank. The other AST hose goes out the bottom of the = tank, and to the inlet side of the water pump. =20 =20 The idea is to take water from the high point in the engine, where air = would tend to collect, and send it to the middle of the AST. When it goes in, = the air rises to the top, and the liquid stays at the bottom. Since the = other hose is on the bottom, only liquid is returned to the engine. =20 =20 The cap on top of the AST has a pressure relief valve, with a hose that = goes to the bottom of a basic overflow jug. When the engine warms up, any = air that was collected in the top of the AST gets pushed out to the overflow jug. When the engine later cools, coolant is sucked back in from the overflow jug. After a few cycles, all the air will be purged, and it = will stay that way unless the system leaks, or needs to be drained for some = other reason. =20 =20 Keep in mind that there are any number of ways to make a functional = cooling system. All you've got to do is seal the pressure, and remove the air. Simple :-) =20 Cheers, Rusty (wishing it was summer here, rather than winter)=20 =20 =20 ------=_NextPart_000_0001_01C5FCEA.DA5E5810 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Al, Rusty = and=20 others.
 
I've been a = little=20 confused with the set- up recommended. Do you have a pressure cap = on the=20 Radiator as well as the Expansion tank and do you have an overflow = bottle=20 attached to the expansion tank.
I've also = seen where=20 the rad pressure cap is not on the rad but on the return to the = pump. 
 
 
I'm not sure how=20 I got dragged into this=20 :-)  
 
Take a look at=20 the system that Mazda used on the FD.  It's a pretty good = system, give=20 or take the plastic parts.  Hmmm, I wonder if the RX-8 uses = the same=20 system.  Anyone = know?
 
As I understand=20 it, the point is to get all the air out of the coolant loop.  The = FD=20 actually has two pressure caps, though only one has a pressure relief = valve in=20 it.  The one without the valve is simply a filler cap, and is = located=20 at the high point of the system (WP housing outlet on the = FD).  =20
 
The one with the=20 pressure relief valve (normal radiator cap) is located on top of a small = tank=20 that is appropriately named the "Air Separator Tank" (AST).  = This tank=20 has two small hoses, which flow coolant through the tank all the=20 time.  One hose comes from the output of the water pump, as = high as=20 possible in the engine.  It runs into the AST, about half way = between top=20 and bottom of the tank.  The other AST hose goes out the = bottom of the=20 tank, and to the inlet side of the water=20 pump.  
 
The idea=20 is to take water from the high point in the engine, where air would = tend to=20 collect, and send it to the middle of the AST.  When it goes in, = the air=20 rises to the top, and the liquid stays at the bottom.  Since = the other=20 hose is on the bottom, only liquid is returned to the=20 engine.  
 
The cap on top of=20 the AST has a pressure relief valve, with a hose that goes to = the=20 bottom of a basic overflow jug.  When the engine warms up, any air = that was=20 collected in the top of the AST gets pushed out to the overflow = jug.  When=20 the engine later cools, coolant is sucked back in from the = overflow=20 jug.  After a few cycles, all the air will be purged, and it will = stay that=20 way unless the system leaks, or needs to be drained for some other=20 reason.  
 
Keep in mind that=20 there are any number of ways to make a functional cooling = system.  All=20 you've got to do is seal the pressure, and remove the air.  Simple=20 :-)
 
Cheers,
Rusty (wishing it=20 was summer here, rather than=20 winter) 
 
 
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